<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- 表单区域 -->
      <el-form ref="loginFormRef" :model="loginFrom" :rules="login_Rules" label-width="0px" class="login_form">
          <!--用户名  -->
        <el-form-item prop="username">
          <el-input v-model="loginFrom.username"  prefix-icon="el-icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginFrom.password"  prefix-icon="el-icon-s-goods" type="password"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
           <el-button type="primary" @click="login" @keyup.enter="login">登录</el-button>
            <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>
<script>
export default {
    data() {
        return {
            // 这是表单登录的数据
            loginFrom: {
                username : 'admin',
                password : '123456'
            },
            // 表单验证规则
            login_Rules : {
                username: [
            { required: true, message: '请输入账号', trigger: 'blur' },  
            { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
          ],
          password: [
            { required: true, message: '请输入密码', trigger: 'blur' },
            { min: 3, max: 8, message: '长度在 3 到 8 个字符', trigger: 'blur' }
          ],
            }
        }
    },
    methods: {
        // 点击重置按钮 重置登录表单
        resetLoginForm() {
            // console.log(this);
            this.$refs.loginFormRef.resetFields();
        },
        // 表单预验证
        login() {
            this.$refs.loginFormRef.validate(async valid => {
                // console.log(valid);
                if(!valid) return;
                const {data : res} = await this.$http.post('login', this.loginFrom);
                // console.log(res);
                if(res.meta.status !== 200) return this.$message.error('登录失败');
                this.$message.success('登录成功');
                window.sessionStorage.setItem('token', res.data.token);
                this.$router.push('/home');
            });
        },
        keyDown(e) {
            if(e.keyCode === 13) {
                this.login()
            }
        }
    },
    //按下enter登录
    mounted() {
         window.addEventListener('keydown',this.keyDown)
    },
    // 销毁按下enter登录事件
    destroyed(){
        window.removeEventListener('keydown',this.keyDown,false);
  }
};
</script>
<style scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.avatar_box {
  height: 130px;
  width: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  padding: 10px;
  box-shadow: 0 0 10px #ddd;
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #eee;
}
.avatar_box img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: #eee;
}
.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
.btns{
    display: flex;
    justify-content: flex-end;
}
</style>
